Deelooted, can you please expand on your question?

The reason I ask is because you have a quote from the Dalai Lama in your signature and Emptiness is a Buddhist teaching. Ergo, are you asking about Emptiness from the Buddhist perspective or are you asking about feeling hollow inside?

I can maybe help define it for you from the Buddhist perspective if you wish as I myself practice Buddhism. (Practice ... not very good at it, but practice. )